SQL Server XML 数据类型查询问题 [英] SQL Server XML Data Type query issue

问题描述

请参阅下面的 SQL Server 2005 脚本

Please see below SQL Server 2005 script

Declare @xmlData XML
SET @xmlData = '<?xml version="1.0"?>
<bookstore xmlns="http://myBooks">
  <book genre="autobiography" publicationdate="1981" 
      ISBN="1-861003-11-0">
    <title>The Autobiography of Benjamin Franklin</title>
    <author>
      <first-name>Benjamin</first-name>
      <last-name>Franklin</last-name>
    </author>
    <price>8.99</price>
  </book>
  <book genre="novel" publicationdate="1967" 
      ISBN="0-201-63361-2">
    <title>The Confidence Man</title>
    <author>
      <first-name>Herman</first-name>
      <last-name>Melville</last-name>
    </author>
    <price>11.99</price>
  </book>
  <book genre="philosophy" publicationdate="1991" 
      ISBN="1-861001-57-6">
    <title>The Gorgias</title>
    <author>
      <first-name>Sidas</first-name>
      <last-name>Plato</last-name>
    </author>
    <price>9.99</price>
  </book>
</bookstore>'

Select  T.Item.query('.')
From @xmlData.nodes('/bookstore/book') AS T(Item)

这个脚本应该给我所有书籍节点的列表.但它没有给出预期的行为.如果我删除 XMLNS 那么它工作正常.谁能解释一下?

This script should give me list of all books node. But it is not giving expected behaviour. If i remove XMLNS then it is working fine. Can anyone explain?

以下工作正常.

Declare @xmlData XML
SET @xmlData = '<?xml version="1.0"?>
<bookstore>
  <book genre="autobiography" publicationdate="1981" 
      ISBN="1-861003-11-0">
    <title>The Autobiography of Benjamin Franklin</title>
    <author>
      <first-name>Benjamin</first-name>
      <last-name>Franklin</last-name>
    </author>
    <price>8.99</price>
  </book>
  <book genre="novel" publicationdate="1967" 
      ISBN="0-201-63361-2">
    <title>The Confidence Man</title>
    <author>
      <first-name>Herman</first-name>
      <last-name>Melville</last-name>
    </author>
    <price>11.99</price>
  </book>
  <book genre="philosophy" publicationdate="1991" 
      ISBN="1-861001-57-6">
    <title>The Gorgias</title>
    <author>
      <first-name>Sidas</first-name>
      <last-name>Plato</last-name>
    </author>
    <price>9.99</price>
  </book>
</bookstore>'

Select  T.Item.query('.')
From @xmlData.nodes('/bookstore/book') AS T(Item)

谁能解释我如何更正第一个脚本?我想用 xmlns 运行脚本.

Can anyone please explain how can I correct first scritp? I want to run script with xmlns.

推荐答案

正如您所说 - 这是因为您的原始 XML 数据位于 XML 命名空间中，如果是这种情况，您还需要在你的 XQuery:

As you say - it's because your original XML data is in a XML namespace, and if that's the case, you also need to make use of that XML namespace in your XQuery:

SELECT 
   T.Item.query('.')
FROM   
   @xmlData.nodes('declare namespace ns="http://myBooks";/ns:bookstore/ns:book') 
   AS T(Item)

您需要将该 declare namespace ns="http://myBooks"; 部分插入到您的 XQuery 中，然后使用定义的名称空间前缀 ns(您可以使用这里的任何东西，真的)引用 XML 对象.

You need to insert that declare namespace ns="http://myBooks"; part into your XQuery and then use the defined namespace prefix ns (you can use anything here, really) to reference the XML objects.

马克

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